committing changes in /etc made by "-bash"

Package changes:

etckeeper/init.d/50vcs-pre-commit-hook

@@ -12,6 +12,37 @@ case "$VCS" in
 #!/bin/sh
 # pre-commit hook for etckeeper, to store metadata and do sanity checks
 set -e
+
+################################################################################
+# Do not run etckeeper inside linked worktrees. An additional worktree can be
+# very useful for resolving *.rpmsave/*.rpmnew files where you are able to merge
+# and check out older versions without changing the whole content of /etc.
+# However while doing such work, avoid modifying .etckeeper since only the /etc
+# directory should track permissions.
+#
+#
+# $ cd /etc
+# $ git worktree list
+# /etc                2984704 [main]
+# /root/etc.worktree  aeae148 [main.worktree]
+# $ git rev-parse --git-dir
+# .git
+# $ cd /root/etc.worktree
+# $ git rev-parse --git-dir
+# /etc/.git/worktrees/etc.worktree
+# $
+#
+################################################################################
+
+# Using 'rev-parse' + 'grep' rather than for instance parsing output from
+# 'worktree list' since the worktree command is not present in older git version
+# and parsing it would be slightly more complex.
+if git rev-parse --git-dir | grep -q /.git/worktrees
+then
+	# Inside worktree, do nothing.
+	exit
+fi
+
 etckeeper pre-commit -d `pwd`
 EOF
 		chmod +x .git/hooks/pre-commit